KANTHAL Alloys for Thermocouples, Extension and
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Alloys for Thermocouples,Extension andCompensating Cables >

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Alloys for Thermocouples,Extension andCompensating Cables >

3Thermocouple AlloysIntroduction and General Comments > The principle on which the modern thermocouple ope-rates is derived from Seebecks discovery that if a cir- cuit is formed using two dissimilar metal conductors with one junction at a higher temperature than the other, then a current will flow in the circuit. The resul- tant emf is proportional to the temperature difference between the junctions.For many industrial heating processes, particularlythose carried out at high temperatures, a thermocou- ple is the most accurate, convenient and simple met- hod of temperature measurement. In...

4Thermocouple AlloysIntroduction and General Comments JIS C 1605-ASTM E 608,E 585 > and other main specifications.During the production of thermocouples used inmineral filled sheathed elements, the emf value chan- ges because of: All thermocouple types are calibrated to ensure thatthe emf is correct over the range of temperatures required by international specifications. Thermocouples required for use at sub zero tempera- tures must be ordered as such. All thermoelectric alloys are individually calibrated against Pt 67 and the emf values at the various temperatures are shown on the...

Cuprothal CL has a very high emf value against Pt67,the highest among the different types of Cuprothal. This property comes from the low content of additional elements in its chemical composition. On the contrary, in the other types of Cuprothal, some additions are necessary to meet the emf values requested by the norms. Due to this characteristic of having a high thermoelectric output, Cuprothal CL is used mostly in the manufacture of thermocouples to detect the pre- sence of the flame in gas burners, connected to safety devices. > E.M.F. testing must be carried out on annealed materi-al....

To form the hot junction, a suitable method has to beadopted to obtain a good electrical contact between the thermocouple wires.At low temperatures, where generallyCopper/Cuprothal (TN) couples are used, soft or silver soldering can be adopted.For Thermothal P/Thermothal N and other combina-tions, for use in high temperature measurements, wel- ding is the only method to obtain a suitable joint.For this purpose oxy-acetylene welding is mostlyused, but arc welding also gives good results. > The wires are cleaned and twisted as in gas weldingand are then held in a vice which is connected to a...

ThermocoupleCompensating NominalAmerican SpecificationorcompositionANSI MC 96-1extensionof the cablecablesmVat TolerancetempStandardSpecial Thermothal P(KP) / Thermothal P(KPX) /Thermothal P(KPX): 90% Ni -10% Cr4.096100 Cб2.2 C Thermothal N(KN) Thermothal N(KNX)Thermothal N(KNX): 95% M+Al-Mn-Si8.139200 аCfrom 0C to 200 аC (Type K) (KX) Thermothal P(KP) / Cu / Cu: 100% Cu4.096100 Cб2.2 C Thermothal N(KN) Cuprothal (VNX)Cuprothal (VNX): 44% Ni-from 0аto 100 C (Type K) (VX)*Balance Cu Thermothal P (EP) / Thermothal P (EPX) -Thermothal P(EPX): 90% Ni-10% Cr6.319100 аC1.7 ѰC Cuprothal (EN)...

28Thermocouple AlloysKanthal Protection Tubes > The advantages offered by using Kanthal protectiontubes for thermocouples are: These metallic protection tubes are manufactured from our high temperature resistance alloy Kanthal AF, 6.0 - 22.0 mm dia and Kanthal APM 22.0 - 40.0 mm with maximum operating temperature in air of 1400 C These tubes are made of moloybdenum disilicade, asour Kanthal Super heating elements. Kanthal Super protection tubes have the following advantages: ? The highest operating temperature is 1700 аC . ? Porosity and brittleness are lower than for ceramicprotection...

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